Woah, what kind of burst was that? Surely it couldn't have lasted more than a second or so (while the jump-scare wears off of the technician :) yet the plane is torched. Thought they are a bit more resilient.
I don't know the exact variant but the F16s have/had a 6 barrel 20mm canon which fires about 100 shells per second. That's a bit more than a few rounds from small arms and more than plenty to destroy the 'target' aircraft. It possibly only took one or two hits to do that damage.
As the other reply said, even if the gun was just triggered for a fraction of a second it's likely that several dozen shells were fired. I'm not sure if NATO uses the same cannon rounds as the US military, but they almost certainly use some form of high explosive incendiary ammo.